Send data between processes via QSharedMemory
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What exact error are you getting ?
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Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
I don't remember if there's a limitation in the characters you can use as key, but i'd start with only ASCII stuff without any special signs.
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Probably off topic, but did you consider using QLocalSocket and WINAPI Named Pipe instead
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Probably off topic, but did you consider using QLocalSocket and WINAPI Named Pipe instead
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Disclaimer
what follows is just speculation, not advice.
The problem with shared memory, as I understand it, is that is no way to signal the reader application that new data is available to consume.
10 MBit/s is not a lot, named pipe should be able to manage it without a problem, in fact, a TCP socket connected to localhost should also be able to handle that transfer rate without a sweat. Both their typical transfer rates are in the multiple Gbit/sec
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Check the detailed documentation of QSharedMemory and the setNativeKey. They explain how to achieve communication with non Qt application.
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@SGaist When I run two copies of Ot application and write some data to shared memory from one of them and the next trying read data from another I have problem: sharedMemory.isAttached() == FALSE for shared memory with same keys.
@MR.Smith Didn't you say before that it is working when using two Qt apps and doesn't work if one app is not a Qt app?
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Disclaimer
what follows is just speculation, not advice.
The problem with shared memory, as I understand it, is that is no way to signal the reader application that new data is available to consume.
10 MBit/s is not a lot, named pipe should be able to manage it without a problem, in fact, a TCP socket connected to localhost should also be able to handle that transfer rate without a sweat. Both their typical transfer rates are in the multiple Gbit/sec
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@MR.Smith Didn't you say before that it is working when using two Qt apps and doesn't work if one app is not a Qt app?
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@jsulm Yes, it's true. I can transfer data from one Qt application to another copy of this Qt application, but I can't transfer data from Qt application to WinAPI application.
